confirmdialog.java

《精通Java Swing程序设计S》这本书所附带的JAVA程序写得很漂亮,都是SWING的实例子,很适合初学者。

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class ConfirmDialog implements ActionListener
{
    JFrame f = null;
    JLabel label = null;
    
    public ConfirmDialog() 
    {
        f = new JFrame("OptionPane Demo");
        Container contentPane = f.getContentPane();
        
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(2,2));
        
        JButton b = new JButton("Show DEFAULT_OPTION");
        b.addActionListener(this);
        panel.add(b);
        b = new JButton("Show YES_NO_OPTION");
        b.addActionListener(this);
        panel.add(b);
        b = new JButton("Show YES_NO_CANCEL_OPTION");
        b.addActionListener(this);
        panel.add(b);
        b = new JButton("Show OK_CANCEL_OPTION");
        b.addActionListener(this);
        panel.add(b);
        
        label = new JLabel(" ",JLabel.CENTER);
        contentPane.add(label,BorderLayout.NORTH);
        contentPane.add(panel,BorderLayout.CENTER);
        f.pack();
        f.setVisible(true);
        
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }    
    
    public static void main(String[] args)
    {
        new ConfirmDialog();
    }
    
    public void actionPerformed(ActionEvent e) 
    {
        String cmd = e.getActionCommand();
        String title = "Confirm Dialog";
        String message ="";
        int messageType = JOptionPane.INFORMATION_MESSAGE;
        int optionType = JOptionPane.YES_NO_OPTION;

        if(cmd.equals("Show DEFAULT_OPTION")) {
            optionType = JOptionPane.DEFAULT_OPTION;
            message = "Show DEFAULT_OPTION Buttons";
        } else if(cmd.equals("Show YES_NO_OPTION")) {
            optionType = JOptionPane.YES_NO_OPTION;
            message = "Show YES_NO_OPTION Buttons";
        } else if(cmd.equals("Show YES_NO_CANCEL_OPTION")) {
            optionType = JOptionPane.YES_NO_CANCEL_OPTION;
            message = "Show YES_NO_CANCEL_OPTION Buttons";
        } else if(cmd.equals("Show OK_CANCEL_OPTION")) {
            optionType = JOptionPane.OK_CANCEL_OPTION;
            message = "Show OK_CANCEL_OPTION Buttons";
        }
    
        int result = JOptionPane.showConfirmDialog(f, message, 
                     title, optionType, messageType);
        
        if (result == JOptionPane.YES_OPTION)
            label.setText("您选择：Yes or OK");
        if (result == JOptionPane.NO_OPTION)
            label.setText("您选择：No");
        if (result == JOptionPane.CANCEL_OPTION)
            label.setText("您选择：Cancel");
        if (result == JOptionPane.CLOSED_OPTION)
            label.setText("您没做任何选择，并关闭了对话框");
    }
}